Go Lang Hashing Example

by Anish

Posted on Wednesday October 31 , 2018

This sample chapter extracted from the book, Go Lang Cryptography for Developers . The Book theme isCryptography is for EveryOne. Learn from Crypto Principle to Applied Cryptography With Practical Example

Hashing

A cryptographic hash function is a hash function which takes an input (or 'message') and returns a fixed-size alphanumeric string. The string is called the 'hash value', 'message digest', 'digital fingerprint', 'digest' or 'checksum'.

The ideal hash function has three main properties:

1. It is extremely easy to calculate a hash for any given data.
2. It is extremely computationally difficult to calculate an alphanumeric text that has a given hash.
3. It is extremely unlikely that two slightly different messages will have the same hash.

Go provides built-in support for hash algorithms, supported Hashing Algorithms and their Digest Sizes

type Hash : Hash identifies a cryptographic hash function that is implemented in another package

        MD4                         // import crypto/md4
        MD5                         // import crypto/md5
        SHA1                        // import crypto/sha1
        SHA224                      // import crypto/sha256
        SHA256                      // import crypto/sha256
        SHA384                      // import crypto/sha512
        SHA512                      // import crypto/sha512
        MD5SHA1                     // no implementation; MD5+SHA1 used for TLS RSA
        RIPEMD160                   // import golang.org/x/crypto/ripemd160
        SHA3_224                    // import golang.org/x/crypto/sha3
        SHA3_256                    // import golang.org/x/crypto/sha3
        SHA3_384                    // import golang.org/x/crypto/sha3
        SHA3_512                    // import golang.org/x/crypto/sha3
        SHA512_224                  // import crypto/sha512
        SHA512_256                  // import crypto/sha512
        BLAKE2s_256                 // import golang.org/x/crypto/blake2s
        BLAKE2b_256                 // import golang.org/x/crypto/blake2b
        BLAKE2b_384                 // import golang.org/x/crypto/blake2b
        BLAKE2b_512                 // import golang.org/x/crypto/blake2b

SHA-1 Hashing Example

package main
import "crypto/sha1"
import "fmt"
func main() {
    s := "Hello 8gwifi.org"
    // The pattern for generating a hash is `sha1.New()`,
    // `sha1.Write(bytes)`, then `sha1.Sum([]byte{})`.
    // Here we start with a new hash.
    h := sha1.New()
    
    // `Write` expects bytes. If you have a string `s`,
    // use `[]byte(s)` to coerce it to bytes.
    h.Write([]byte(s))

    // This gets the finalized hash result as a byte
    // slice. The argument to `Sum` can be used to append
    // to an existing byte slice: it usually isn't needed.
    bs := h.Sum(nil)

    // SHA1 values are often printed in hex, for example
    // in git commits. Use the `%x` format verb to convert
    // a hash results to a hex string.
    fmt.Println(s)
    fmt.Printf("%x\n", bs)
}

The output

Hello 8gwifi.org
5523bdf845330363e738519c87f5f0dafe72c051

MD5 Hashing Example

package main
import "crypto/md5"
import "fmt"
func main() {
    s := "Hello 8gwifi.org"
    // The pattern for generating a hash is `sha1.New()`,
    // `sha1.Write(bytes)`, then `sha1.Sum([]byte{})`.
    // Here we start with a new hash.
    h := md5.New()
    
    // `Write` expects bytes. If you have a string `s`,
    // use `[]byte(s)` to coerce it to bytes.
    h.Write([]byte(s))

    // This gets the finalized hash result as a byte
    // slice. The argument to `Sum` can be used to append
    // to an existing byte slice: it usually isn't needed.
    bs := h.Sum(nil)

    // MD5 values are often printed in hex, for example
    // in git commits. Use the `%x` format verb to convert
    // a hash results to a hex string.
    fmt.Println(s)
    fmt.Printf("%x\n", bs)
}

The output

Hello 8gwifi.org
5d567716bc513834a40ecf179fcab1ba

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